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Also to their advantage, they knew that genes in psychrophilic, or cold-loving, bacteria have evolved to work best in arctic temperatures.

“Adaptive evolution of the heat-shock response in the Antarctic psychrophilic ciliate, Euplotes focardii: hints from a comparative determination of the hsp70 gene structure.”

As a bacteriologist, Dr. Arrhenius knew that there were three temperature types of bacteria, those living at low temperatures, the psychrophilic; those living at the temperatures of the human body giving us so much trouble, the mesophilic; those living at high temperatures near geysers, volcanoes etc., the thermophilic.